Graphic Optar is Wollensak Raptar rebadged.
Graphex shutter is Wollensak Rapax rebadged.
Graphex/Rapax came in #1, #2, #3 shutter sizes but are not the same as Copal sizes.
The 90mm Optar is in a #1 Rapax which requires a 1.1775 inch / 30mm mount hole.
http://www.keh.com/camera/Large-Format-Lens-Boards/1/sku-LF500090156340?r=FE
A Graphic C board is for the Anniversary Speed Graphic._________________The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

I'm pretty happy this is all sorted out, as I've been getting an itch to use my Pacemaker Speed more and more, but the 135mm just isn't wide enough for my typical subjects. In a few more days (assuming my new shutter doesn't need a CLAC immediately) I can really put it to good use.

I can confirm that the lens and shutter do fit in that lens board properly. The lens is mounted on the camera right now. It is a very tiny lens and shutter, much smaller than I expected. And shockingly, it doesn't look to need an immediate CLAC.

One quick question...this lens takes a push-on filter like my 135. What size is this? It is smaller than Series VI. Series V?

Take a good ruler and measure the outside diameter of the lens front barrel. 1 inch = 25.4 mm. Then look up in this post to see which series size it is.
http://graflex.org/helpboard/viewtopic.php?t=264
Find a series ? adapter the size of your measurement._________________The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

The Optar 90 mm lens takes a 1-1/4 inch series VI slip ring; see http://photo.net/large-format-photography-forum/008FuQ , scroll down the page almost to the bottom for the relevant posting. So you will look for a 31.5 mm series VI slip ring, and you're in luck because this is one of the more common sizes, since the "standard" (for 2x3 format) 101mm and 103 mm Optar and Century lenses take the same size. Your challenge will be to find one; look on the auction site, and if there are still camera shows or shops, preferably an old-line one, in your area you could look in those places, too.